http://www.beemans.net/images/Austrian%20airguns.htm
here is a good link for the history of air rifles

the better pics have too many mb to send
20 oz off/on paint ball bottle 1/2" ball valve up to rifled 18mm bbl
bolt action breech load. shoots 2.5oz lead bullets @550-650 fps
depending on temp.
load,cock (to the off position) the spring loaded ball valve, charge the chamber between the bottle and the ...

there is a good welding tutorial on the miller welding web page
low cost dc tig from harbour freight

as i'm new to this forum this may be an old idea. i tripod mount my golf ball gun. i mount a torch lighter (squeeze type sparker) inside the chamber of my gun drilling a tiny hole for the pull wire. this allows me to stand to the side. i use acetylene gas for propellant! BIG BANG!
one end cap ...

i don't know who was first with the potato gun but on july 4 1985 in nashville, tenn. my nephew was lamenting the fact he could get no fireworks. i told him i had made many noise making cannons utilizing a combustion chamber ( to restrict and intensify the pressure) much like the nozzle on a rocket ...

in the past i've tried many propellant gases for fuel, most with poor results. starting ether in the spray can from the parts house works
fairly well but the concentration is critical. MAPP gas works pretty
well because it contains acetylene. the very very best by far is
acetylene gas from a torch ...